H-1B transfer Question

My Company A filed a H1B cap and got selected and got approval for 3 years! and I haven’t done my stamping yet. but, I got an offer from Company B. so can I transfer my H1B to that company B without doing stamping from company A

no reply yet? is my question wrong or what is the problem? I am really looking forward for an answer plz someone reply.

yes you can do so without any issue

How? can you plz share some light?